Fix Trndi description and add GlucoseTray section (#245)

Corrected a typo in the Trndi description and added a new section for GlucoseTray.

Author: Raimund58

docs/nightscout/downloaders.md

@@ -270,7 +270,7 @@ This is a cross-platform application that uses the Nightscout API. It aims to pr
 
 ### [trndi](https://github.com/slicke/trndi)
 
-Trndi is a *desktop app* that shows the your blood sugar and graph. It works with *Nightscout* and *Dexcom Share* at the moment. It also supports the *xDrip* app, connecting over the local network/Wi-Fi.
+Trndi is a *desktop app* that shows your blood sugar and graph. It works with *Nightscout* and *Dexcom Share* at the moment. It also supports the *xDrip* app, connecting over the local network/Wi-Fi.
 
 <img src="/nightscout/img/LockOK.png" width="25px" />
 
@@ -284,6 +284,16 @@ Trndi is a *desktop app* that shows the your blood sugar and graph. It works wit
 
 <img src="https://user-images.githubusercontent.com/60714349/230734030-d6ae822f-1a48-48d2-8df0-cb168146176b.png" width="500px"/>
 
+### [GlucoseTray](https://github.com/Delubear/GlucoseTray)
+
+GlucoseTray is a *desktop app* that shows your blood sugar in the icon tray. It works with *Nightscout* and *Dexcom Share* at the moment.
+
+<img src="/nightscout/img/LockOK.png" width="25px" />
+
+<img src="https://raw.githubusercontent.com/Delubear/GlucoseTray/master/2019-05-03_16-18-24.png" width="150px"/>
+
+</br>
+
 </br>
 
 ## Linux